风荷载下单层柱面网壳的动力稳定

Dynamic instability of a single-layer cylindrical reticulated shell under wind loads

以一单层柱面网壳为例,利用Budiansky-Roth准则研究空间结构在风荷载下的动力稳定性。介绍了Budiansky-Roth准则,通过风洞试验获得单层柱面网壳上的风荷载并研究其动力稳定性,讨论了初始几何缺陷、风向角和风压系数的影响,并将动力失稳分析结果与我国规范和阵风响应因子法(GRF法)计算动力响应导致结构破坏的方法作了比较。研究结果表明,空间结构进行风荷载下的稳定性设计时有必要研究其在风荷载下的动力稳定性。

A single-layer cylindrical reticulated shell was taken as an example to study the dynamic instability of spatial structures with Budiansky-Roth criterion.Budiansky-Roth criterion was explained,and the wind tunnel test of the single-layer cylindrical reticulated shell was conducted to obtain fluctuating wind loads on it.Then,its dynamic instability under fluctuating wind loads was studied,the influences of initial geometrical imperfections,wind direction anagles and wind pressure coefficients were discussed,comparisons among the stability analysis results and those using the Chinese standard and the gust response factor（GRF） method were made.The results showed that studying on the dynamic instability of spatial structures under fluctuating wind loads is necessary.